package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService
{

    //微信服务接口地址
    public static final String WX_Login = "https://api.weixin.qq.com/sns/jscode2session";


    @Autowired
    private UserMapper userMapper;


    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 微信登陆
     * @param userLoginDTO
     * @return
     */
    @Override
    public User WXLogin(UserLoginDTO userLoginDTO)
    {
        //调用微信接口服务，获得当前微信用户的OpenID
        String openid = getOpenId(userLoginDTO.getCode());


        //判断OpenID是否为空。如果为空表示登陆失败，抛出业务异常
        if(openid == null)
        {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);//登陆失败
        }


        //判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);

        //如果是新用户，自动完成注册
        if(user == null)
        {
             user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
             userMapper.insert(user);
        }

        //返回该用户对象
        return user;
    }


    /**
     * 调用微信接口服务，获得当前微信用户的OpenID
     * @param code
     * @return
     */
    private String getOpenId(String code)
    {
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_Login, map);//map容器为请求参数

        log.info("微信接口响应 : {}",json);

        //将JSO你格式的数据转为普通字符串
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");

        return openid;
    }
}
